There really isn't that much space inside the robot to begin with once you include the second set of batteries so adding a chain drive would be very difficult.
Actually, rethinking this, I have the same problem as Manta. I am sure that robot uses a pair of curved edges at the rear of the robot to guide the robot over as it is self righting (the two robots are darn near the same shape). Might be worth fabricating something like that out of the spare HDPE I have laying around to see if that helps at all along with more voltage. Would also help with the link protection as well.
If I lift the robot off of the arm a little and then fire the arm, it does manage to get up on its back and then no further so it *is* getting there.
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